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However, a conveniently hidden option in the latest WhatsApp for Android beta suggests that the service will soon share user data with the social network "to improve [your] Facebook experiences".

This option to share data with Facebook was uncovered by Android developer Javier Santos using terminal commands, and he has published the findings on his Google+ page (below).

It's not yet clear what kind of information will be shared between WhatsApp and Facebook, but it will presumably include details such as your WhatsApp contacts list to make it easier to find friends on the social network, and vice versa.

Thankfully the new WhatsApp 'feature' appears to be disabled by default, according to Santos.

WhatsApp and Facebook have yet to comment.

This latest WhatsApp beta includes a new end-to-end encryption option that promises to make your message so secure that "WhatsApp and third parties can't see it". This is probably a bid to sweeten those now concerned about the security of their data.

There's also a new Documents section where you'll be able to find all of the files you receive from your WhatsApp contacts.

"For many years, we've asked some people to pay a fee for using WhatsApp after their first year. As we've grown, we've found that this approach hasn't worked well," said WhatsApp.

"Many WhatsApp users don't have a debit or credit card and they worried they'd lose access to their friends and family after their first year. So over the next several weeks, we'll remove fees from the different versions of our app and WhatsApp will no longer charge you for our service." µ